Gerald Grattan McGeer (6 January 1888 – 11 August 1947) was a lawyer, populist politician, and monetary reform advocate in the Canadian province of British Columbia.

McGeer first attained renown in the 1920s as a lawyer representing the British Columbia government in its case to reduce freight rate differentials on goods shipped through the Rocky Mountains by rail.

Reductions in discriminatory freight rates made it economically feasible for prairie grain to come west and be exported through Vancouver's port rather than seaports in eastern Canada and the United States.

He was, however, able to reform the police department and the civic government, but it was his battles against communism that garnered him the most publicity, at least in his first year in office.

Shortly before the trekkers left, another Communist-led strike broke out on the waterfront, culminating with another bloody clash that became known as the Battle of Ballantyne Pier.

McGeer organized elaborate celebrations to mark Vancouver's golden jubilee in 1936, which was controversial in the midst of the depression.

While some applauded his efforts to boost civic pride as a positive step towards bringing back prosperity, others denounced extravagances such as a $35,000 fountain for Stanley Park's Lost Lagoon while the city teetered on the edge of bankruptcy.

McGeer's lifelong mission was to attain a position where he could implement his reform ideas, but his flamboyant, aggressive, and eccentric style and theories alienated the powerbrokers in his own party.

While still mayor, McGeer ran as a Liberal Party candidate in the 1935 federal election and won in the riding of Vancouver—Burrard by a thin margin.

His tirades against bankers and the banking system proved especially popular during the Great Depression, and he regularly lectured to packed houses across the country.

McGeer returned to civic politics with another landslide election victory in 1946, this time on a Non-Partisan Association slate.